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Organism
  Plantae
      Tracheophyta
            Magnoliopsida
                    Caryophyllales
                            Cactaceae
                              Cactoideae
                                     Acanthocereus
                                             Acanthocereus tetragonus
                                     Cereus
                                             Cereus repandus
                                     Mammillaria
                                             Mammillaria mammillaris
                                             Mammillaria nivosa
                                     Melocactus
                                             Melocactus broadwayi
                                             Melocactus intortus
                                     Pilosocereus
                                             Pilosocereus royenii
                                     Selenicereus
                                             Selenicereus grandiflorus
                                             Selenicereus triangularis
                                                   [Hylocereus triangularis]
                                     Opuntia
                                             Opuntia caracassana
                                             Opuntia curassavica
                                             Opuntia elatior
                                             Opuntia ficus-indica
                                             Opuntia stricta
                                                   [Opuntia dillenii]
                                             Opuntia triacantha
                              Opuntioideae
                                     Consolea
                                             Consolea macracantha
                                     Rhipsalis
                                             Rhipsalis baccifera
                                                   [Rhipsalis cassytha]